To make your own swords and knives, or athames (pronounced a-THAW-mays), you can affix crystals of your choice onto metalwork you purchase at a New Age store or from a sword specialist. Or, if you purchase an athame that already has crystals, you can change your sword so it is imbued with your energy. The idea of the sword is that you wield it within the spirit world to keep bad energy and negativity at bay. With your sword in your hand, you are the master or mistress of your domain; you rule your circle of magic. The bolline is usually a white-handled knife that is used for making other tools; it can be used only within the magical circle, the boundary you form by marking the four corners and the four directions through speaking ritual.